0MahavishnuMan 11 years ago Perhaps (at the expense of coming off a troll) you could try spelling tutorials and typing lessons, both of which are free. I won't harp on this as much as others may, as it sounds like you might be doing this for a school science project, but clear communication will be the key to your bright future.If I understand correctly, you are using the car fan motor as a DC generator to power an LED. There are several variables to consider here, and all of them are important to a successful circuit here.First, if it doesn't light up no matter how fast the blades turn, you may have the LED connected backwards. LED stands for "light-emitting diode", and a diode only allows current to flow in one direction. Be careful with this, as too much reverse current will blow the LED.Second, the fan may be somewhat inefficient. In a car, the fan spins rapidly due to the fact that it is supplied with 11-15 V. However, the speeds gained from wind will be a small fraction of this. Typically, an LED has a forward voltage of 3 V, so in my estimate the fan may need to spin anywhere from 200-500 RPM to generate this voltage.The way the blades are designed aerodynamically, the weight of the blades, and the motor itself can be at fault here. Maybe using a different motor with lighter fan blades would be more productive.You also might try adding a Joule thief to the circuit. If this is for a class, be sure to learn how a Joule thief works so your teacher can give you credit for research.